linux-kernel - [PATCH 0/3] arm64: kprobes: Fix bugs in kprobes for arm64

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Date:   Thu,  1 Dec 2022 23:38:52 +0900
From:   "Masami Hiramatsu (Google)" <mhiramat@...nel.org>
To:     Catalin Marinas <catalin.marinas@....com>,
        Will Deacon <will@...nel.org>
Cc:     Mark Rutland <mark.rutland@....com>,
        Mark Brown <broonie@...nel.org>,
        Kalesh Singh <kaleshsingh@...gle.com>,
        Masami Hiramatsu <mhiramat@...nel.org>,
        Marc Zyngier <maz@...nel.org>,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        Sandeepa Prabhu <sandeepa.s.prabhu@...il.com>
Subject: [PATCH 0/3] arm64: kprobes: Fix bugs in kprobes for arm64

Hi,

I found some bugs in kprobes for arm64. One is a critical issue, which
will cause a kernel crach easily with lockdep[1/3]. Others are minor
issues and rare cases. [2/3] let do_page_fault() fixup the page fault
in kprobes user handler, and [3/3] is more like code cleanup and
returns DBG_HOOK_ERROR if it can not handle kprobe's BRK (but that
should not happen.)

Thank you,

---

Masami Hiramatsu (Google) (3):
      arm64: Prohibit probing on arch_stack_walk()
      arm64: kprobes: Let arch do_page_fault() fix up page fault in user handler
      arm64: kprobes: Return DBG_HOOK_ERROR if kprobes can not handle a BRK


 arch/arm64/kernel/probes/kprobes.c |   87 +++++++++++++++---------------------
 arch/arm64/kernel/stacktrace.c     |    7 ++-
 2 files changed, 41 insertions(+), 53 deletions(-)

--
Masami Hiramatsu (Google) <mhiramat@...nel.org>